Re: Best Compression Ratio for Best MPG - 440 Question
[Re: WyleECoyote]
#1877247
07/24/15 02:03 PM
07/24/15 02:03 PM
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Joined: Aug 2005
Posts: 6,033 Salem
Grizzly
Moparts Proctologist
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Moparts Proctologist
Joined: Aug 2005
Posts: 6,033
Salem
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From a financial and practical point of view I would get the overdrive and a set of 3.08's or 3.54's first. Used transmissions can be had for $500 and up, and those diffs are everywhere, probably $250 to $500.
For a thousand bucks you will pick up at least 5mpg, and maybe up to 7mpg more.
FWIW, a 488 V10's have been known to get 15, 16mpg so there is no reason a 440 can't do it as well.
All highway mpg I'm quoting, if this is in town use then everything goes out the window.
Mo' Farts
Moderated by "tbagger".
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Re: Best Compression Ratio for Best MPG - 440 Question
[Re: HotRodDave]
#1879008
07/27/15 11:43 AM
07/27/15 11:43 AM
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Joined: Feb 2003
Posts: 21,318 Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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I ran 10-1 with an iron head 318 in an extended cab long bed 98 ram with a stock cam and very tight quench, even pulling a 65 dart on an open trailer and a bed full of parts out of LA on the big pass it never pinged on 87 octane california crap gas. I would expect the smaller displacement is coming into play there as well.
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Re: Best Compression Ratio for Best MPG - 440 Question
[Re: WO23Coronet]
#1879224
07/27/15 03:57 PM
07/27/15 03:57 PM
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Joined: Jan 2004
Posts: 8,659 fredericksburg,va
cudaman1969
master
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master
Joined: Jan 2004
Posts: 8,659
fredericksburg,va
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I really wish I could find Dunnuk's article, he got ridiculous mileage with his 440, I'm sure it was 20 when empty I read same art. He used a comp cam hdy. roller kinda big but was in mid 20s on fuel mileage in a car. I kept article but cant find it either, maybe he will we this and help Might add the cam had some weird numbers for duration.
Last edited by cudaman1969; 07/27/15 04:02 PM.
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